Prepared as a contribution to the Rio+10 process, this book offers a wide range of views and perspectives on sustainability per se and on environmental education and communication in particular. It is being published in the framework of the project "Sustainability Centres in the North Sea Region" but significantly enhanced to include case studies and examples of on-going works in a number of industrialised and developing nations. This publication is, thanks to its scope and international nature, of interest to anyone concerned with the sustainability debate, one of the most important matters in the 21st Century.